Fix links, and add separator to README

README.md

@@ -83,7 +83,8 @@ Some of SCIP's plugins are imported to the rust interface as traits. Currently t
 | Branching rule   | [branchrule.rs](https://github.com/scipopt/russcip/blob/main/src/branchrule.rs) | [docs](https://docs.rs/russcip/latest/russcip/branchrule/trait.BranchRule.html) |
 | Variable Pricer  | [pricer.rs](https://github.com/scipopt/russcip/blob/main/src/pricer.rs)         | [docs](https://docs.rs/russcip/latest/russcip/pricer/trait.Pricer.html)         |
 | Event Handler    | [eventhdlr.rs](https://github.com/scipopt/russcip/blob/main/src/eventhdlr.rs)   | [docs](https://docs.rs/russcip/latest/russcip/eventhdlr/trait.Eventhdlr.html)   |
-| Primal Heuristic | [heuristic.rs](https://github.com/scipopt/russcip/blob/main/src/heuristic.rs)   | [docs](https://docs.rs/russcip/latest/russcip/eventhdlr/trait.Heuristic.html)   |
+| Primal Heuristic | [heuristic.rs](https://github.com/scipopt/russcip/blob/main/src/heuristic.rs)   | [docs](https://docs.rs/russcip/latest/russcip/heuristic/trait.Heuristic.html)   |
+| Separator        | [separator.rs](https://github.com/scipopt/russcip/blob/main/src/separator.rs)   | [docs](https://docs.rs/russcip/latest/russcip/separator/trait.Separator.html)   |
 
 To add a custom plugin to a SCIP `Model` instance, you should implement its trait and call the corresponding
 `include_{PLUGIN_NAME}` method. For examples on implementing the specific plugin trait you can check the tests in the